<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/Breadcrumb' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item >商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
             <!-- 提示区 -->
              <el-alert
                title="添加商品信息" type="info"
                center show-icon  :closable="false">
            </el-alert>
            <!-- 步骤条区 -->
            <el-steps align-center :space="200" :active="activeIndex-0" finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
                label-width="100px" label-position="top">

                <el-tabs v-model="activeIndex" :tab-position="'left'" 
                    :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name='0'>
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight " type="number">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                              <el-cascader style="width:300px"
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps "
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name='1'>
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name"
                         v-for="item in manyTableData" :key = item.attr_id>
                            <!-- 复选框组 -->
                              <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox v-for="(cb,i) in item.attr_vals"
                                :key = i :label="cb" border>
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name='2'>
                        <el-form-item :label="item.attr_name" 
                        v-for="item in onlyTableData" :key=item.attr_id>
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name='3'>
                        <!-- action 表示图片要上传到的api地址 -->
                        <el-upload
                            :action=uploadURL
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name='4'>
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">
                            添加商品
                        </el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previeImg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex:'0',
            //添加表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类数组
                goods_cat:[],
                //上传的图片路径数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                //商品的参数（数组），包含 `动态参数` 和 `静态属性`
                attrs:[]
            },
            //添加表单的验证规则
            addFormRules:{
                goods_name : [
                    { required: true, message: '请输入商品名称'
                    , trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格'
                    , trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量'
                    , trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量'
                    , trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true, message: '请选择商品分类'
                    , trigger: 'blur' }
                ]
            },
            //商品分类列表
            catelist:[],
            //级联选择器配置对象
            cateProps:{
                expandTrigger: 'hover',
                //看到的值分类名称
                label:'cat_name',
                //选中的值分类id
                value:'cat_id',
                children:'children'
            },
            //动态参数列表数组
            manyTableData:[],
            //静态属性列表数组
            onlyTableData:[],
            //上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers 请求头对象
            headerObj:{
                Authorization : window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false,
            
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获得所有商品分类数据
        async getCateList(){
            const {data : res} = await this.$http.get('categories')
            if( res.meta.status != 200){
                return this.$message.error('获取商品分类数据失败！')
            }
            this.catelist = res.data
            console.log(this.catelist)
        },
        //级联选择器选中项变化触发函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            //控制级联选择器只能选三级参数
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat = []
            }
        },
        //根据返回的  boolean 值 控制 tab标签的切换
        beforeTabLeave(activeName,oldActiveName){
            if( this.addForm.goods_name === ''){
                this.$message.error('请先输入商品的名称!')
                return false
            }
            if(oldActiveName === '0' && this.addForm.goods_cat.length !==3){
                this.$message.error('请先选择商品分类!')
                return false
            }

        },
        //tab 被选中时触发
        async tabClicked(){
            //证明访问的是动态参数面板 
            if( this.activeIndex === '1'){
                const {data : res} =  await this.$http.get(`categories/
                ${this.cateId}/attributes`,{params : {sel : 'many'}})
                
                if( res.meta.status !== 200){
                    return this.$message.error('获取动态参数失败！')
                }
                console.log(res.data)
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals === '' ? []:
                    item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }

            //证明访问的是静态属性面板 
            if( this.activeIndex === '2'){
                const {data : res} =  await this.$http.get(`categories/
                ${this.cateId}/attributes`,{params : {sel : 'only'}})
                
                if( res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data)
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals === '' ? []:
                    item.attr_vals.split(' ')
                })
                this.onlyTableData = res.data
            }

        },
        //处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        //处理图片移除效果
        handleRemove(file){
            console.log(file)
            //1.获取将要删除的图片临时路径
            const filePath = file.response.data.tmp_path
            //2.从 pics 数组中，找到这个图片对应 的 索引    
            const i =
            this.addForm.pics.findIndex(x =>
                x.pic === filePath)
            //3.调用数组的 splice 方法 ，把图片信息对象 从pics 数组 中 移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        //监听图片上传成功事件
        handleSuccess(response){
            console.log(response)
            //1.拼接得到一个图片信息对象
            const picInfo = { pic : response.data.tmp_path}
            //2.将图片信息对象 push 到 pics 数组 中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        //添加商品
        async add(){
            this.$refs.addFormRef.validate( valid =>{
                if(!valid) return this.$message.error('请填写必要的表单项!')
            })
            //执行添加的业务逻辑
            //lodash cloneDeep(obj)
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            //处理动态参数和静态属性
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id : item.attr_id,
                    attr_value : item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })
            //处理动态参数和静态属性
            this.onlyTableData.forEach(item => {
                const newInfo = {
                    attr_id : item.attr_id,
                    attr_value : item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log(form)

            //发起请求添加商品
            //商品名称，必须是唯一的
            const {data : res} = await this.$http.post('goods',form)

            if(res.meta.status != 201){
                return this.$message.error('添加商品失败!')
            }
            this.$message.success('添加商品成功！')
            this.$router.push('/goods')
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return 
        }

    }
}
</script>
<style lang="less" scoped>
::v-deep.el-checkbox{
    margin: 0 10px 0 0 !important;
}
::v-deep.previeImg{
    width: 100%;
}
::v-deep.btnAdd{
    margin-top: 15px;
    float: right;
}
</style>